docs: def restore_backup(self, subid, backupid, params=None):
          ''' /v1/server/restore_backup
          POST - account
          Restore the specified backup to the virtual machine. Any data
          already on the virtual machine will be lost.
  
          Link: https://www.vultr.com/api/#server_restore_backup
          '''
          params = update_params(params, {
              'SUBID': subid,
              'BACKUPID': backupid
          })
          return self.request('/v1/server/restore_backup', params, 'POST')